Dual Band 2.4GHz 5GHz USB WiFi Wireless Adapter (USB-AC55 B1). Utilizes 802.11 5GHz WiFi technology to provide maximum speeds for smooth 4k UHD streaming and low latency gaming. Dual Band antennas and 256QAM technology allow speeds up to 400Mbps with the 2.4GHz band, and up to a blazing fast 867Mbps using the 5GHz band.